    YUI().use('dd-delegate', 'dd-drop-plugin', 'dd-constrain', 'dd-proxy', function(Y) {
        var del = new Y.DD.Delegate({
            container: '#demo',
            nodes: 'li'
        });

        del.on('drag:start', function(e) {
            e.target.get('node').setStyle('opacity', '.5');
        });
        del.on('drag:end', function(e) {
            e.target.get('node').setStyle('opacity', '1');
        });

        del.dd.plug(Y.Plugin.DDConstrained, {
            constrain2node: '#play'
        });

        del.dd.plug(Y.Plugin.DDProxy, {
            moveOnEnd: false,
            cloneNode: true
        });

        var drop = Y.one('#drop').plug(Y.Plugin.Drop);
        drop.drop.on('drop:hit', function(e) {
            drop.set('innerHTML', 'You dropped: <strong>' + e.drag.get('node').get('innerHTML') + '</strong>');
        });


    });

